Electronic scratch filter for bowed instruments

Details Electronic scratch filter for bowed instruments Electronic scratch filter for bowed instruments

1989-04-27

1989-12-05

Witkowski, Stanley J.

Music

Instruments

Electrical musical tone generation

84741, 84DIG9, G01H 112, G01H 318

Patent

active

048844861

ABSTRACT:
The tone signal from a transducer monitoring the music vibrations of a bowed musical instrument contains an objectionable friction noise component which is removed by passing the tone signal through a high-pass filter having a variable cutoff frequency which is controlled by a pitch detector monitoring the fundamental frequency of a played note in the tone signal. The cutoff frequency of the filter is kept slightly below the fundamental frequency of the played note to avoid altering the tone color of the tone signal. When no fundamental frequency is detected by the pitch detector, the cutoff frequency of the filter remains at a pre-determined minimum which may be adjustable by the musician for best effect when strings are both bowed and plucked. The filtered tone signal may be applied to the pitch detector in order to increase the accuracy of the pitch detection process and thus increase the accuracy of the noise reducing characteristics of the system.

REFERENCES:
patent: 3911776 (1975-10-01), Beigel
patent: 3960043 (1976-06-01), Brand
patent: 4151775 (1979-05-01), Merriman
patent: 4300431 (1981-11-01), DeRocco
patent: 4627323 (1986-12-01), Gold

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